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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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package com.oracle.truffle.regex.tregex.nfa;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.regex.tregex.automaton.TransitionSet;
import com.oracle.truffle.regex.tregex.util.json.Json;
import com.oracle.truffle.regex.tregex.util.json.JsonValue;

import java.util.ArrayList;
import java.util.Iterator;

public class ASTTransitionSet implements TransitionSet, Iterable<ASTTransition> {

    private final ArrayList<ASTTransition> transitions;

    public ASTTransitionSet(ASTTransition transition) {
        this.transitions = new ArrayList<>();
        transitions.add(transition);
    }

    public ASTTransitionSet(ArrayList<ASTTransition> transitions) {
        this.transitions = transitions;
    }

    @Override
    public ASTTransitionSet createMerged(TransitionSet other) {
        ArrayList<ASTTransition> merged = new ArrayList<>(transitions);
        ASTTransitionSet ret = new ASTTransitionSet(merged);
        ret.addAll(other);
        return ret;
    }

    @Override
    public void addAll(TransitionSet other) {
        for (ASTTransition t : (ASTTransitionSet) other) {
            if (!transitions.contains(t)) {
                transitions.add(t);
            }
        }
    }

    @Override
    public Iterator<ASTTransition> iterator() {
        return transitions.iterator();
    }

    @Override
    public int hashCode() {
        return transitions.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        return this == obj || (obj instanceof ASTTransitionSet && transitions.equals(((ASTTransitionSet) obj).transitions));
    }

    @TruffleBoundary
    @Override
    public JsonValue toJson() {
        return Json.array(transitions);
    }
}
